# True to actual RC task, but slowest
constant @alpha2 = 'aa'  ..  'zz';
constant @alpha3 = 'aaa' .. 'zzz';

# Reduced alphabets for speed during development & testing
constant @alpha2 = [X~] <a   m p y z> xx 2;
constant @alpha3 = [X~] <e l m p x z> xx 3;